MXR - Flanger/Doubler ( M-126 )  [schematic]

Discussion regarding early stompbox technology: 1960-1975 Please keep discussion focused and contribute what info you have...
EddieM117
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Post by EddieM117 »

A quite rare schmematic.Fantastic sounding unit! If someone has the owner manual-let me know!

Eddie
flanger-doubler.jpg
mxrflangerdoubler1.jpg

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Dirk_Hendrik
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Post by Dirk_Hendrik »

Thanks quite a big lot! :D

mongerson
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Post by mongerson »

does anyone know where i can find a list of components? i'm going to simulate in Electronic Workbench and design a printed circuit board using Ultraroute. If anyone is interested i'm willing to share once complete.

EddieM117
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Post by EddieM117 »

no list of components--just the schematic .
If you draw a schematic without the doubler part let me know. I could help with some detailed images-i have unit at home.

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soulsonic
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Post by soulsonic »

I had a friend who had one of these... never got around to playing with it. He's moved to another part of the state. I'm tempted to try and get back in touch with him and see if he still has it.
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Cow4prez
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Post by Cow4prez »

what is the doubler part?

drfrankq
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Post by drfrankq »

in the top left of the pic of the unit i see a red button, what's that? i have one and that doesn't appear there, also there's an extra jack on the back, did you modify it? Great picture!

EddieM117
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Post by EddieM117 »

The red knob is "mod". The preowner installed a momentary effect in/out switch via flip flop. I think it was done to reduce switching noise-->studio use.

eddie

drfrankq
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Post by drfrankq »

cool. i'd like a mod for a expression input for speed! I tried the modulation CV but it seemed only 1/10th of the range, i use a passive guitar volume pedal, maybe i need one for line level? anyone try this? thanks

drfrankq
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Post by drfrankq »

the doubling is done by the Reticon 5101 chip

the flanger in here is awesome, thanks for the picture too, makes me say ooo and aaa

the CV covers the "manual" and goes across the sweep without the LFO, but for me the LFO is important to the flange sound

also think CV controls the delay in double mode, but i find doubling is more sensitive to loud signals so not very useful

i wanna change the CV to do speed, but unfortunately my skill stops at appreciation :) If anyone tries it out let me know! Thanks

-Frank

Nisei
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Post by Nisei »

Sorry to kick such an old topic but does anyone know how the sound of the flanger of the M-126 compares to the M-117? I'm looking for an M-126 but just for he flanger. If the M-117 sounds equally great then it's easier to go that route.

uncleboko
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Post by uncleboko »

PWM :?: :?: :?:

Nisei
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Post by Nisei »

No, MXR!!! ;)

Nisei
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Post by Nisei »

uncleboko wrote:PWM :?: :?: :?:
But seriously, what do you mean?

uncleboko
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Post by uncleboko »

Nisei wrote:
uncleboko wrote:PWM :?: :?: :?:
But seriously, what do you mean?
Pulse Width Modulation. :D

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pedalgrinder
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Post by pedalgrinder »

any chance of a pic of the track side might be able to do a clone board from it possibly. thanks :thumbsup
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Nisei
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Post by Nisei »

uncleboko wrote:Pulse Width Modulation. :D
Ah yes, I know what PWM means but what do you mean in this case? Both flangers have the same controls so are they very different internally?
I'd love to have a clone of this (well, only of the flanger part, does this mean the Reticon 5101 can be omitted?) with SAD1024 replaced by MN3007. Did anyone ever consider building this?

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MrHuge
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Post by MrHuge »

I have some other data in a PDF on the Flanger doubler.
PM me

Also, http://www.uaudio.com/store/delay-modul ... ubler.html

Cheers,
-Mr. Huge

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MrHuge
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Post by MrHuge »

Here's what I got on the M126 Flanger doubler
-Mr. Huge
Attachments
MXR M126 Service Schematics.pdf
Flanger Doubler M126
(296.78 KiB) Downloaded 252 times

sinner
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Post by sinner »

Thanks Mr.Huge, long time not seen :)

BTW - mine is bigger

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